/*
**    Copyright (C) 2003-2011 Institute for Systems Biology
**                            Seattle, Washington, USA.
**
**    This library is free software; you can redistribute it and/or
**    modify it under the terms of the GNU Lesser General Public
**    License as published by the Free Software Foundation; either
**    version 3 of the License, or (at your option) any later version.
**
**    This library is distributed in the hope that it will be useful,
**    but WITHOUT ANY WARRANTY; without even the implied warranty of
**    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
**    Lesser General Public License for more details.
**
**    You should have received a copy of the GNU Lesser General Public
**    License along with this library; if not, write to the Free Software
**    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/

package org.systemsbiology.util;

import java.util.Iterator;

import org.systemsbiology.iteration.IterableFromIterator;

/**
 * Class that counts the number of items in an Iterable that match a given filter.
 * @author anorberg
 *
 * @param <T> Type for the enumeration and filter.
 */
public class Tally<T> {
	private Filter<? super T> filter;
	public Tally(Filter<? super T> filter){
		this.filter = filter;
	}
	
	public long count(Iterable<? extends T> source){
		long ret = 0;
		for(T t:source){
			if(filter.accept(t)){
				++ret;
			}
		}
		return ret;
	}
	
	public long count(Iterator<? extends T> source){
		return count(new IterableFromIterator<T>(source));
	}
}
